Got a twin Carb version of a Nissan 280z (l28) engine to go into a Tina but every time I run it for more than 15 minutes the exhaust manifold (6 branch manifold ) glows white hot. Any ideas anyone?

 

is the maifold new??it will do that wen it's new

 

No not new had so many conflicting views I don't know wots right

 

New won't make any difference, if it really is running WHITE hot I'm surprised nothing melted yet!!
Check for retarded ignition timing(fuel continuing to burn in exhaust) and seriously weak mixture/air leak.
tabetha

 

What he ^^ said.

Martin

 

Thanks will do